Steam-boiler



(No Model.) 2 Sheets-Sheet 1.

J. M. DUNN & W. E. SIDWELL- STEAM BOILER. No. 342,738. Patented May 25,1886.

i 88S I I five to %l 1} E b n r I army (No Model.) 2 SheetsSheet 2. J.M. DUNN & W. E. SIDWELL.

STEAMEBOILER- No. 342,738. Patented May 25, 1886.

TZL'ZYzasseS Photo-Lilhgnpher. wumrl nm. u C.

' NITED STATES PATENT OFFICE.

JOHN M. DUNN AND WILLIAM E. SlDWELL, OF NORWALK, OHIO.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 342,738, dated May25,1886.

Application filed November 20,1885. Serial No. 183,422. (No model.)

T 0 all whom it may concern:

Be it known that we, JOHN M. DUNN and WILLIAu E. SIDWELL, citizens ofthe United States, residing at Norwalk, in the county of Huron and Stateof Ohio, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being hadtherein to the accompanying drawings.

Our invention relates to steam-boilers, and has for its object theprovision of a simple and efficient heater which shall have the propercirculation of water through it and very thorough circulation of heatand flame around it.

The heater consists of a curved water back or chamber mounted directlyover the rear end of the fire-chamber in such way as to receive the fullforce of the escaping flame and heat against it, and shall cause thesame to pass down under it and then up over it before escaping. Thisheater is attached to the sides of the boiler. The boiler is of thereturn-flue pattern, and has the water-chamber or boiler propersurrounding the fire-box, which latter is located centrally in thestructure,with gratebars placed in it, and provided with suitable doorsto the exterior of the boiler. The arrangement of circulation-pipes forthe boiler and heater is such as to cause the cold water to be drawnfrom the bottom of the boiler, and after becoming heated in the heaterto be delivered into the boiler at the top. This obviates the diflicultyusually encountered in having the heat gradually work its way down inthe boiler, and enables us to accelerate the heating. The constructionby which we effect these objects is illustrated in the accom panyingdrawings, and hereinafter described, and pointed out in the claims.

In the drawings, Figure 1 is acentral longitudinal section of ourimproved boiler. Fig. 2 is a front elevation of the same, and Fig. 3 arear elevation with the end plate removed. Fig. 4 is a plan view of aportion of the boiler, showing the manner of making connection betweenheater E and boiler at the top.

Similar letters of reference indicate corresponding parts in all thefigures where they occur.

A is the-body of the boiler,which is divided into the fire-box B andwater-chamberC by the interior cylinder,D. The water-chamber O isbounded at a distance from each end of the boiler body by disks orplates OG*,which serve at the same time as supports for thefire-cylinder D. This arrangementleaves a fire-space, b, at the rearend, into which the fire-box B opens, and a similar space, b, around thefirebox at the front end. These spaces 6 b are connected by return-finesF, as shown. A grate-surface, 13*, is provided in box B, having suitablesupports, as shown.

In space b, secured to the walls of the boilerbody and so placed as tolie partially over the open end of the fire-box, is the curved orinclined heater or water-back E. This heater is formed of two sheets ofboiler-iron, held to: gether and supported by the stay-pins e e, asshown. The top of the heater is secured to the top of the firebox andthe sides to the walls of the boiler-body by means of flanged edges,with which it is provided, and bolts or rivets.

Situated over the upper portion of the mouth of the fire-box, andextending well down it,

' and approaching close to the rear end or head of the boiler, theheater, as will be readily appreciated, is in the best possible positionto receive the full benefit of the heat and flame from the fire-box, asthe same will flow outand strike the heater with full force, and then becompelled to flow down it and around its end or lower side, and thencethe natural upward tendency of the heat and flame will carry it upwardover the outside of the heater, and the return-fines 12* will induceanother turn and draw the said heat and flame downward to be carried offafter having imparted to the water in the heater an intense degree ofheat.

Circulation for the heater is made in the most careful and efficientmanner. It receives the water through pipe f from the lower portion ofthe boiler, thus taking the colder strata of the boiler water. This itreceives, as shown, into the lower part of it, and where it will becomeat once hot, and rise in the heater. After receiving the proper degreeof heat the water flows out through pipe f into the boiler. Thewater-supply for the boiler is throughthe heater by way of pipe G. Thispipe f, as shown in Fig. 4., leads from the part E out through the shelland back into the boiler. The water thus taken into the boiler is firstheatedto boiling-point in the heater, and when 2. In a steam-boiler, thecombination, with 20 introduced in the boiler, instead of reducing thewater-containing portion of the boiler, a the temperature of thecontents thereof, as is fire-box surrounded by said water-containingusually done, our supply-water tends to inportion, and a space, as b, atthe end of the 5 crease the same. fire-box, divided from thewater-containing Having thus described our invention, what portion,ofawater-heatingdevice placedinsaid 25 we desire to claim, and secure byLetters Patspace b, and extending from the top of the fireent, isboxdownward in a curved or sloping position, 1. In a steam-boiler, thecombination, with and almost touching the rear wall of said [O thefire-box having the water-jacket snrroundspace, and having connections ff to the waing it, of a water-heater chamber consisting ofter-containing portion, and a water-supply, as 30 a receptacle,substantiallyas described, placed G, substantially as set forth.

directly over the end of the fire-box inaslop- In testimony whereof weafiix our signatures 7 ing position, and havinga connecting-pipe, as inpresence of two witnesses.

15 f, extending from said heating-chamber to the JOHN M. DUNN.

boiler or water-jacket beneath the fire-box, WILLIAM E. SIDWELL. andaconnection, as f, near the top of said Witnesses: chamber, extendinginto the water-jacket at T. H. KELLOGG, that point, as set forth. G. W.CORWIN.

